Share 'Frequency: How often to start online discussions with clients'

I'd like my clients thinking of me everyday, but that's not practical. They have a business to run, probably family and hopefully, some personal interests. Realizing that the more they learn about my business, the more value they will receive, how often can I initiate forums, RSS updates, webinars, etc.? Is it weekly, bi-weekly, monthly or some other frequency?